I found it, thank you so much for your work!
Wait, so is it 99 puzzles in the demo and 150 extra in the full version (so 249 total)? Or is it 51 extra (so 150 total)?
Look cool, but price seems a bit steep, so will wait for a sale to get it.
Sorry to clutter this comment page with this question, but will the Playtris game ever be back (maybe under a different name, or diffent place to get it?). Thanks for your work!